Debug MOI test failures

[odow]

There are a few MOI tests that fail:

Juniper.jl/test/MOI_wrapper.jl

Lines 57 to 72 in ec81a10

	# ====================== Unexplained failures ======================
	# LOCALLY_SOLVED instead of INFEASIBLE
	"test_conic_linear_INFEASIBLE_2",
	# NORM_LIMIT instead of LOCALLY_SOLVED
	"test_conic_linear_VectorOfVariables",
	# INVALID_MODEL instead of LOCALLY_SOLVED
	"test_linear_VectorAffineFunction_empty_row",
	# Attributes are not checked properly on copy_to
	"test_model_copy_to_UnsupportedAttribute",
	"test_model_copy_to_UnsupportedConstraint",
	# supports_constraint not checking for element types
	"test_model_supports_constraint_ScalarAffineFunction_EqualTo",
	"test_model_supports_constraint_VariableIndex_EqualTo",
	"test_model_supports_constraint_VectorOfVariables_Nonnegatives",
	# Result index not being checked properly
	"test_solve_result_index",

This could be bugs in Juniper, or bugs in the MOI wrapper.